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Classical gravitational bremsstrahlung in particle collisions at transplanckian energies is studied in M4×Td. The radiation efficiency ϵ≡Erad/Einitial is computed in terms of the Schwarzschild radius rS(s), the impact parameter b and the Lorentz boost factor γcm and found to be ϵ=Cd(rS/b)3d+3γcm2d+1, larger than previous estimates by several powers of γcm≫1. This means that in the ultrarelativistic...
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